puppetize haproxy (for brewster), the very basics (RT-4660)

I separated out the puppet haproxy.cfg file.  If you want to
use haproxy with your own config file, you can pass it to
the haproxy class. - otto

Change-Id: I2dbf4e28f8797988aa79073afceb21831fa29639
Merge "puppetize haproxy (for brewster), the very basics (RT-4660)" into production